171947 has 2 divisors, whose sum is σ = 171948. Its totient is φ = 171946.

The previous prime is 171937. The next prime is 172001. The reversal of 171947 is 749171.

It is a weak prime.

It is an emirp because it is prime and its reverse (749171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171947 - 2¹⁶ = 106411 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 171947.

It is not a weakly prime, because it can be changed into another prime (171917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85973 + 85974.

It is an arithmetic number, because the mean of its divisors is an integer number (85974).

2¹⁷¹⁹⁴⁷ is an apocalyptic number.

171947 is a deficient number, since it is larger than the sum of its proper divisors (1).

171947 is an equidigital number, since it uses as much as digits as its factorization.

171947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 29.

The square root of 171947 is about 414.6649249695. The cubic root of 171947 is about 55.6072648927.

The spelling of 171947 in words is "one hundred seventy-one thousand, nine hundred forty-seven".